Thrown guard ignoring fifty (5)
I believe the answer is:
shied
'thrown' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for shied that I've seen before include "started" , "horse did this?" , "Jumped nervously; threw" , "Flung, tossed" , "Cast" .)